From d7c7405281ac0d45486ed1560d0c6d9c0697143b Mon Sep 17 00:00:00 2001
From: Dirk Thomas <dirk-thomas@users.noreply.github.com>
Date: Fri, 1 Mar 2019 11:29:24 -0800
Subject: [PATCH] invalidate wrong cached result for diagnostic_msgs

---
 CMakeLists.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 50c81a9d..709c8f91 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,6 +67,8 @@ if(BUILD_TESTING)
     # and not the ROS 1 package
     set(_ros1_diagnostic_msgs_DIR "${ros1_diagnostic_msgs_PREFIX}/share/diagnostic_msgs/cmake")
     if("${diagnostic_msgs_DIR}" STREQUAL "${_ros1_diagnostic_msgs_DIR}")
+      # invalidate the cached result to retry finding the package next time
+      unset(diagnostic_msgs_DIR CACHE)
       message(FATAL_ERROR "Failed to find ROS 2 package 'diagnostic_msgs'")
     endif()
     set(TEST_ROS1_BRIDGE TRUE)